Many people showed interest in the overall project so here is some more info.
Here is a copy of a post I made on another forum regarding my fuel system. The photos are of a similar setup that a guy put together.
For anyone wondering why would we go through the expense and trouble.
Answer: Prevent fuel starvation.
A lean condition under power/load will kill a $$$$ in a few seconds.
The silver can is the Swirl Pot. It acts as a buffer tank keeping the pressure fuel pumps fed even if fuel sloshes away from the tank pickups and the supply pumps pull air.
The Black box is the trap door Surge Tank. It is designed to trap fuel inside the box as it sloshes around in the tank. Its primary purpose is to keep the pickups submerged in fuel at all times.
This is a VERY effective setup that will supply constant, air free fuel under almost all conditions.
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Paul… Awesome setup.
Violator:
I have been planning a similar system on my Mustang.
I have spent a lot of time lurking at the Megasquirt Forums (DIY EFI) and there has been discussion regarding swirl pots and surge tanks. I built my own megasquirt and now comes time for the fuel system.
The car will be a street car mostly and not under high boost often. I do not want to recirculate retarded amounts of fuel for no reason. For this reason it will be a return system with dual pressure pumps. I want a secondary pump to come online in a HIGH POWER mode.
My reasoning is to design a system very much like yours where the load is split somewhat equally between the 3 pumps.
I see 2 areas where the pumps need to work hard.
1- Pushing fuel from the fuel cell, the length of the car, to the engine bay.
(assuming open ended line) Here the pump is fighting the resistance of the lines
and the forces on the fuel under hard acceleration.
2- Creating enough pressure and flow to match the requirement of the injectors.
Why cant we split these 2 requirements so the 2 pressure pumps dont do all the work?
I was thinking of running a single supply pump, in the tank, which feeds fuel from the surge tank in the cell to a swirl pot in the engine bay.
We would then have 2 pressure pumps feeding fuel from the swirl pot to the injectors.
Fuel would be returned to the swirl pot which would have a overflow line that would lead back to the cell. I would also dump the overflow line into the cell surge tank. I just hope that this method will not cause any vapor lock problems. My theory is that under power (and dual pump, full fuel system load) the motor will consume the heated fuel in the loop quickly.
Please let me know what you think.
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